YT ASMR Matrix addition and subtraction source code

public class MatrixAddSubtract {



    public static void main(String[] args) {


        int[][] matrixA = new int[][]{{3,6,10,-1,4}, {6, 10, 5, 3, 1}, {4,4,10,40,-10}};
        int[][] matrixB = new int[][]{{1,-5, 0, 0, 0}, {2, 0, -14, 3, 2}, {3,3,10,100,-30}};

        System.out.println("\n\nMatrix A:");
        printMatrix(matrixA);
        System.out.println("\n\nMatrix B:");
        printMatrix(matrixB);
        System.out.println(checkIfRectangular(matrixA));

        System.out.println("Subtracting A + B");
        int[][] resultAPlusB = subtractMatrixAB(matrixA, matrixB);
        printMatrix(resultAPlusB);

    }


    //adds A and B
    public static int[][] addMatrixAB(int[][] a, int[][] b) {

        int[][] resultingMatrix = new int[a.length][a[0].length];
        //validation
        //A and B both need to be m x n in dimensions or else it would not work
        if ((a.length == b.length) && (checkIfRectangular(a)) && checkIfRectangular(b)) {

            for (int i = 0; i < a.length; i++) {

                for (int j = 0; j < a[i].length; j++) {
                    resultingMatrix[i][j] = a[i][j] + b[i][j];
                }
            }
        }
        else {
            System.out.println("error: Matrix must have the same dimensions / each matrix must have equal columns");
            return new int[][] {{4}};
        }
        return resultingMatrix;

    }


    //subtracts B from A

    public static int[][] subtractMatrixAB(int[][] a, int[][] b) {

        int[][] resultingMatrix = new int[a.length][a[0].length];
        //validation
        //A and B both need to be m x n in dimensions or else it would not work
        if ((a.length == b.length) && (checkIfRectangular(a)) && checkIfRectangular(b)) {

            for (int i = 0; i < a.length; i++) {

                for (int j = 0; j < a[i].length; j++) {
                    resultingMatrix[i][j] = a[i][j] - b[i][j];
                }
            }
        }
        else {
            System.out.println("error: Matrix must have the same dimensions / each matrix must have equal columns");
            return new int[][] {{4}};
        }
        return resultingMatrix;

    }


    private static boolean checkIfRectangular(int[][] x) {

        //get length of the first subarray
        int subArraylength = x[0].length;

        for (int i = 0; i < x.length; i++) {
            if (x[i].length != subArraylength) {
                return false;
            }
        }

        return true;

    }


    public static void printMatrix(int[][] x) {
        for (int[] i : x) {

            for (int j : i) {
                System.out.print(j + "\t");
            }
            System.out.println("\n");

        }
    }


}